Welcome to Pprune!
In the Wannabee forum there are many experienced airline pilots who are very happy to give up there time to help a person get a first foot on the ladder. However they do expect people to do a little research first before asking questions. The Search function is there for just that reason; there are also 'stickies' which do take some reading but they contain a wealth of relevant facts and will teach you a lot about the industry.
The question that you ask has indeed been covered many times before therefore can I ask you to do the research and then pm me if you need to ask the question again?
Good luck
HWB